NUC eGPU random hangup during boot  

Hi,

I have an Intel NUC 7i7BNB with a Sonnet eGFX Breakaway Box 350 and an MSI Geforce GTX 1050ti working under Fedora 29.
The gpu works well, the only problem is that the system often hangs during boot. It seems that the eGPU is not detected. I tried to add more waiting time at grub with no avail.

/usr/libexec/gdm-x-session[1026]: (II) NVIDIA dlloader X Driver 410.78 Sat Nov 10 22:15:52 CST 2018
Dec 21 11:57:42 /usr/libexec/gdm-x-session[1026]: (II) NVIDIA Unified Driver for all Supported NVIDIA GPUs
/usr/libexec/gdm-x-session[1026]: xf86EnableIOPorts: failed to set IOPL for I/O (Operation not permitted)
/usr/libexec/gdm-x-session[1026]: (EE) No devices detected.
/usr/libexec/gdm-x-session[1026]: (EE)
/usr/libexec/gdm-x-session[1026]: Fatal server error:
/usr/libexec/gdm-x-session[1026]: (EE) no screens found(EE)
/usr/libexec/gdm-x-session[1026]: (EE)
/usr/libexec/gdm-x-session[1026]: Please consult the Fedora Project support
/usr/libexec/gdm-x-session[1026]: at http://wiki.x.org
/usr/libexec/gdm-x-session[1026]: for help.
/usr/libexec/gdm-x-session[1026]: (EE) Please also check the log file at "/var/lib/gdm/.local/share/xorg/Xorg.0.log" for additional information.
/usr/libexec/gdm-x-session[1026]: (EE)

Any suggestion to solve this would be greatly appreciated.

- Gabor
----

This is how it was installed:

# nuc bios legacy mode
advanced/security/thunderbolt security level - legacy mode

# nvidia driver from rpmfusion
sudo dnf install xorg-x11-drv-nvidia akmod-nvidia

# blacklist nouveau
sudo mv /boot/initramfs-$(uname -r).img /boot/initramfs-$(uname -r)-nouveau.img
sudo dracut -f /boot/initramfs-$(uname -r).img $(uname -r)

# fedora prime - might not be needed
git clone  https://github.com/bosim/FedoraPrime.git 
cd FedoraPrime
sudo make install
sudo fedora-prime-select nvidia

# lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation Iris Plus Graphics 650 (rev 06)
06:00.0 VGA compatible controller: NVIDIA Corporation GP107 [GeForce GTX 1050 Ti] (rev a1)

# edit /etc/X11/xorg.conf.d/20-nvidia.conf and add NVIDIA bus id

Section "Device"
  Identifier "Nvidia Card"
  Driver "nvidia"
  VendorName "NVIDIA Corporation"
  Option "NoLogo" "true"
  Option "AllowExternalGpus" "true"
  BusID "PCI:6:0:0"
EndSection